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Hyponyms: acoustic phenomenon, atmospheric phenomenon, boundary layer, chaos, cloud, decalescence, electrical phenomenon, electricity, energy, power, event, field, field of force, force field, force, hysteresis, resonance, mechanical phenomenon, opacity, optical phenomenon, pressure, pressure level, force per unit area, reflection, reflexion, refraction, resolving power, resolution, conduction, conductivity, propagation, interaction, fundamental interaction, surface tension, syzygy, transparency, transparence, turbulence, turbulency, flotation, floatation